| Alpine Linux | — | — | 2-clause BSD License, GNU General Public License, version 2.0, MIT License |
| AOSC OS | Anthon Open Source Community | — | — |
| Arch Linux | Allan McRae, Anatol Pomozov, Aaron Griffin, Felix Yan | 2002 | GNU General Public License |
| Fedora Linux | Red Hat, IBM, Fedora Project | 2003 | MIT License |
| FreeBSD | — | 1993 | 2-clause BSD License |
| FreeRTOS | — | 2003 | MIT License |
| Gentoo Linux | — | — | GNU General Public License |
| Haiku | Michael Phipps, Haiku Inc. | 2002 | MIT License |
| HarmonyOS | Huawei | 2019 | — |
| NetBSD | — | 1993 | BSD licenses |
| Nura | — | — | GNU General Public License, version 3.0 |
| OpenBSD | OpenBSD Project, Theo de Raadt | — | ISC license |
| Redox | Jeremy Soller | — | MIT License |
| RIOT | Martin Lenders, Benjamin Valentin, Alexandre Abadie | — | GNU Lesser General Public License, version 2.1 |
| RTEMS | Sebastian Huber, Joel Sherrill | — | GNU General Public License |
| Tock | Brad Campbell, Amit Levy | — | Apache Software License 2.0, MIT License |
| Ubuntu | Canonical Ltd. | 2004 | — |
| Zephyr | Wind River Systems, Linux Foundation | — | Apache Software License 2.0 |